Why young men take to terrorism (specifically the islamic kind)?

Today, I read something funny on the internet.

It is well known that Islam allows polygamy (specificall, only Polygyny). So, there was this guy on a public forum who was saying something to this effect: “Muslims are allowed to have 4 wives at a time. Given the gender ratio, it means almost 75% of the young muslim men are unmarried. So, without a way to subdue their… you know what… drive, they take to fundamentalist terrorism since it gives them a way to expend their hormonal rage through actual rage.”

It is funny how some people think.